Calipers.



No. 887,068. PATENTED MAY 12, 1908. H. T. & J. J. GOLLINET.

GALIPERS.

APPLICATION FILED JULY 19. 1907.

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JOHN J. QOLLINET AND HENRY T. COLLINET, OF CHICAGO, ILLINOIS.

CALIPEES.

No. ss7,oes.

Specification of Letters Patent. I

Patented May 12, 1908.

Application filed July 19, 1907. Serial No. 38%,623.

To all whom it may concern:

Be it known that we, JOHN J. COLLINET and HENRY T. COLLINET, citizens :of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Calipers, of which the following is a specification.

Our invention relates to calipers and articularly contemplatesthe revision 0 improved means whereby t e legs thereof and their respective en aging points may be spring pressed against tIie ob ect being gaged to obtain an absolutely correct. measurement. 1

Our invention further and specifically resides in the following features of construction, arran ement and o eration, which will be hereinafter described with reference to the accompanying drawings forming a part of this specification, in whichlike numerals are used to designate like arts throughout the several figures, and in w ich Figure 1 is an elevation of a pair of outside calipers in their practical application and constructed tion. Fig. 2 is a similar view of apair of in side calipers constructed in accordance with our invention, and Fig. 3 is an enlar ed detail, partly in section, of parts to be ereinafter s ecifically referred to.

In t e accompanying drawings, A and B represent the respective legs of a pair of'calipers, pivoted at C one another and gage an object such as D.

The leg .18 is provided with an engaging point E at its free end, while according to our invention we provide a leg A substantially shorter in length than the leg B, and pivot a supplemental leg 1 at the free end thereof of such length and shape beyond its pivot 2 as to form with the legA, a member corresponding exactly in shape an size to the leg B. The supplemental member 1 is curved to lie upon the le A for a considerableportion of its lengt being provided with a transverse slot 3 and a longitudinal slot 4 leading from said transverse slot 3. The supplemental leg 1 is further constructed at its rear end to form an indicator 5 resting above graduations6 arranged transversely upon the leg A. The leg A is further rovided with a rigid threaded stud 7'exten ing upwardl therefrom throu h the transverse slot 3-0 the supplementa leg 1, and provided with a flat spring 8 secured therein and an 'justing in accordance with our inven- 'to swing with relation to extending rearwardly therefrom within the narrow longitudinal slot 4 of said leg 1. An adjusting screw 9 is adapted to engage u on the stud 7 and to bear upon the supp emental le 1 to press the same tight against the Ieg A and lock the same in a desired degree of adjustment.

' The operation of our invention is as follows: The user having first loosened the adscrew 9, the indicating points E and 10 may be engaged about the object I) to more readily and actively gage the same. 'In this operation the supplemental leg 1 will be free upon its pivot w ile spring pressed by the flat spring 9 to force its engaging point 10 inwardly toward the engaging point E of the leg B in the case of the outside calipers shown in Fig. 1 and outwardly away from the engaging point E of the leg B in the case of the mside calipers shown in Fig. 2. As this fine adjustment is had, the operator must note particularly the indications of the pointer 5 upon the graduations 6, and while the cali- 'pers are engaged about the object, or when removed, the adjusting screw 9 may be rotated vto securely lock the supplemental leg 1 at the exact adjustment, thus obtaining a better and more accurate gage of the ob ect.

It will be seen that the same construction may be employed in the inside caliper as shown in Fig. 2, in gaging the bore F.

Having thus fully described our invention, we claim:

1. The combination in a caliper comprising a long leg provided withan engaging point at its outer end, of a short leg )IVOtGd to said long'leg, a supplemental mem er pivotally connected with one end-adjacent the .outer end of said short member and forming a continuation of and completing said short leg said supplemental member being formed at its rear end to provide an indicator and having a transverse slot therein, said short leg, being transversely graduated adjacent said indicator and having a threaded rigid stud projecting upwardly therefrom within said transverse slot, spring means for fdrcin f the outer engaging end of said supplementa member against the face of the object to be gaged, and an adjusting screw ada ted for engagement upon said threaded stu to lock said supplemental member when in the desired degree of adjustment, substantially as described.

2. The combination in a caliper compris ing a long leg having an engaging point at its end, and a short leg pivoted to said long leg, of a supplemental member pivotally mounted Wilt; one end adjacent the endof said short leg and forming a continuation thereof and com leting the same, said supplemental member sing formed at its rear end to provide an indicator, and having a transverse slot therein and a narrow longitudlnal slot extending from said transverse slot, said therefrom Within said transverse s 0t, and

having a flat spring secured Within said stud and extending therefrom Within said longiee7,oee I tudinal slot to said supplemental member to normally force the outer engaging end thereof against the face of the object to be gaged, and an adjusting screw adapted for engagement upon said rigid stud to securely look said supplemental member when in the desired degree of adjustment, substantially as described.

In testimony whereof We ,aflix our signatures in presence of two Witnesses.

JOHN J. COLLINET.

HENRY T. CULLINET.

Witnesses JOHN W. BRITTON, GENEVIEVE WARD. 

